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We report temperature and thermal-cycling dependence of surface and bulkstructures of double-layered perovskite Sr3Ru2O7 single crystals. The surfaceand bulk structures were investigated using low-energy electron diffraction(LEED) and single-crystal X-ray diffraction (XRD) techniques, respectively.Single-crystal XRD data is in good agreement with previous reports for the bulkstructure with RuO6 octahedral rotation, which increases with decreasingtemperature (~ 6.7(6)degrees at 300 K and ~ 8.1(2) degrees at 90 K). LEEDresults reveal that the octahedra at the surface are much more distorted with ahigher rotation angle (~ 12 degrees between 300 and 80 K) and a slight tilt((4.5\pm2.5) degrees at 300 K and (2.5\pm1.7) degrees at 80 K). While XRD dataconfirms temperature dependence of the unit cell height/width ratio (i.e.lattice parameter c divided by the average of parameters a and b) found in aprior neutron powder diffraction investigation, both bulk and surfacestructures display little change with thermal cycles between 300 and 80 K.

Surface and Bulk Structural Properties of Single Crystalline Sr3Ru2O7